Adam Clarke on Job 34:7

Drinketh up scorning like water? - This is a repetition of the charge made against Job by Eliphaz, Job 15:16. It is a proverbial expression, and seems to be formed, as a metaphor, from a camel drinking, who takes in a large draught of water, even the most turbid, on its setting out on a journey in a caravan, that it may serve it for a long time. Job deals largely in scorning; he fills his heart with it.